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  1. #include <iostream>
  2. using std::cout;
  3. using std::endl;
  4.  
  5. extern int NODATA;
  6.  
  7. auto size = sizeof(NODATA);
  8. auto align = alignof(NODATA);
  9.  
  10. void f(int c = NODATA)
  11. {
  12.     cout << "c=" << c << endl;
  13. }
  14.  
  15. decltype(NODATA) main()
  16. {
  17.     cout << "size=" << size << endl;
  18.     cout << "align=" << align << endl;
  19.  
  20.     f(0);
  21.  
  22.     // above here should all work, below may not depending on 
  23.     // implementation and its optimization settings
  24.  
  25.     if(false && NODATA)
  26.     {
  27.         cout << "false && NODATA" << endl;
  28.     }
  29.     else if(true || NODATA)
  30.     {
  31.         cout << "true || NODATA" << endl;
  32.     }
  33.     else
  34.     {
  35.         int i = NODATA;
  36.     }
  37.  
  38.     // this would definitely cause a linker error
  39.     // f();
  40.     // but this may not
  41.     false ? f() : f(1);
  42.  
  43.     f((NODATA-NODATA) + 2);
  44.  
  45.     //not optimized out by ideone.com's version gcc with whatever flags are set
  46.     //f((NODATA/NODATA) + 2);
  47.     //f((4*NODATA)/NODATA);
  48.  
  49.     //"sorry, unimplemented: non-trivial designated initializers not supported"
  50.     //int arry[3] = { [0] = 1, [1] = NODATA, [1] = 2 };
  51.  
  52.     //"sorry, unimplemented: non-trivial designated initializers not supported"
  53.     //struct {
  54.     //    int first;
  55.     //    int second;
  56.     //    int third;
  57.     //} strct = {.first = 1, .second = NODATA, .second = 2};
  58.  
  59.  
  60.     return NODATA^NODATA;
  61.  
  62.     int i = NODATA;
  63. }
Success #stdin #stdout 0s 2852KB
comments ()
stdin
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Standard input is empty
stdout
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size=4
align=4
c=0
true || NODATA
c=1
c=2
https://ideone.com/hyjOxR
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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